Buy ebook Practical python ai projects: mathematical models of optimization problems with google or-

Page 1


Practical Python AI Projects: Mathematical Models of Optimization Problems with Google OR-Tools 1st Edition Serge Kruk

Visit to download the full and correct content document: https://textbookfull.com/product/practical-python-ai-projects-mathematical-models-ofoptimization-problems-with-google-or-tools-1st-edition-serge-kruk/

More products digital (pdf, epub, mobi) instant download maybe you interests ...

Manufacturing: Mathematical Models, Problems, and Solutions First Edition Zainul Huda

https://textbookfull.com/product/manufacturing-mathematicalmodels-problems-and-solutions-first-edition-zainul-huda/

Google Gemini for Python: Coding with BARD Oswald Campesato

https://textbookfull.com/product/google-gemini-for-python-codingwith-bard-oswald-campesato/

IoT Projects with NVIDIA Jetson Nano: AI-Enabled Internet of Things Projects for Beginners Agus Kurniawan

https://textbookfull.com/product/iot-projects-with-nvidia-jetsonnano-ai-enabled-internet-of-things-projects-for-beginners-aguskurniawan/

Solving applied mathematical problems with MATLAB Second Edition Chen

https://textbookfull.com/product/solving-applied-mathematicalproblems-with-matlab-second-edition-chen/

Practical Python Design Patterns: Pythonic Solutions to Common Problems Badenhorst

https://textbookfull.com/product/practical-python-designpatterns-pythonic-solutions-to-common-problems-badenhorst/

Practical Machine Learning for Streaming Data with Python: Design, Develop, and Validate Online Learning Models 1st Edition Sayan Putatunda

https://textbookfull.com/product/practical-machine-learning-forstreaming-data-with-python-design-develop-and-validate-onlinelearning-models-1st-edition-sayan-putatunda/

Mathematical Models For Decision Making With Multiple Perspectives 1st Edition Gomes

https://textbookfull.com/product/mathematical-models-fordecision-making-with-multiple-perspectives-1st-edition-gomes/

Mathematical Problems in Data Science Theoretical and Practical Methods 1st Edition Li M. Chen

https://textbookfull.com/product/mathematical-problems-in-datascience-theoretical-and-practical-methods-1st-edition-li-m-chen/

Google Tools Meets Middle School 1st Edition Michael J. Graham

https://textbookfull.com/product/google-tools-meets-middleschool-1st-edition-michael-j-graham/

Another random document with no related content on Scribd:

Cookhouses were no safer than other spots behind the line, and the cook’s job was not a cushy one. In one cookhouse in the ravine a shell exploded when some dixies of rice were on the fire. The cook, uninjured in body but indignant at the mess made, gazed disgustedly at the debris. His only comment was: “Might have been a b wedding here!”

Sickness diminished with the coming of the cooler weather, and as health improved moods of depression abated, and the irresponsible cheeriness of the British soldier, in spite of all he had gone through and all that lay before him, shone forth under conditions the reverse of exhilarating. Perhaps the rum-punch had some slight share of responsibility on one occasion. A party of transport men, howling a chorus on their way down the ravine in a drizzling and depressing rain, on being challenged by a sentry at the Eski Line, proceeded to serenade him. The sentry, whose job gave little scope for hilarity, inquired in disgusted tones: “What the are you so happy about? Is the war over?”

The unhappy experience of a quartermaster’s storeman provides a moral—or even more than one. He had noticed two delectable rumjars in the orchard by Pink Farm, with a Scottish sentry posted over them. After profound meditation he decided upon a frontal attack, and, accompanied by a fellow-conspirator, walked up to the sentry and said: “I’ve been sent for the rum for the puir laddies in the trenches. They’ll be awfu’ glaad to get it, and it’ll do them guid.” He then told his colleague—incidentally addressing him as “Jock”—to take one jar while he took the other, and off they went towards the nullah, the sentry appearing quite satisfied, and curiously lacking in that nasty suspicious spirit so prevalent among persons in charge of valuables, and so discouraging to enterprises of this sort. Half-way to the nullah they entered a deep ditch, with the intention of working their way round to the dump, where water was already boiling in anticipation. But the jars were heavy and temptation could no longer be resisted. A cork was pulled out with great care and some difficulty —and they found themselves in possession of two bottles of creosol. Their remarks are unprintable.

GULLY

BEACH. DIVISIONAL HEADQUARTERS.

GULLY BEACH INDIAN A T CARTS

GULLY

BEACH.

QUARTERS OF THE 2ND AND 3RD FIELD AMBULANCES.

GULLY RAVINE THE “ROAD” OR RIVER BED

A new subaltern arrived about this period, and was handed over at the Battalion Dump to the post-corporal, who was on his way to H.Q. in the line. Presently a shell passed overhead, and the corporal explained that “it’s not addressed to us; it’s addressed to t’ beach,”

GULLY RAVINE A “DUMP ”
GULLY RAVINE. HEADQUARTERS 1ST FIELD CO. AND WAY UP TO THE ESKI LINES.

some miles away The sub., being a bit on his dignity, thought fit to tell the corporal—an ancient member of his battalion, and more in the nature of a family friend than anything else at Battalion H.Q.— that he need not be funny. A little later, probably within range of a deceased mule, the sub. unbent, and said: “Rather queer smell here, corporal?” “Yes, sir,” was the reply, “this is where we bury uz officers.”

Mining Operations

Instruction in sinking shafts and making galleries had already been given by expert miners. A Mining Company was now formed, extra pay being granted to the men, and it was reasonably expected that this would be filled from the many colliers in the Division. A Staff Officer who was wont to boast that experts could be produced for any kind of job, inspected the company and proceeded to question the men. To the first he said—

“Well, my man, how do you like your task?”

“Oh, it’s not so bad, sir.”

“Extra pay all right, eh?”

“Yes, but you can’t spend it, sir.”

“I suppose the work comes quite naturally to you?”

“No, sir, I’m a solicitor’s clerk.”

The second man was a music-hall artiste, and the third a barber. Much discouraged, the officer ceased to interrogate.

The enemy exploded mines on the 3rd, 15th, 18th, 21st, 22nd and 29th of September, all opposite their trench in front of our right, known as “The Gridiron.” Three of these damaged our parapet, and all caused interference with our field of fire. The repairing of the damage done on September 22 was made possible by the enterprise of bombing parties of the 6th Manchesters under Lieutenant Collier, who kept up a steady hail of bombs from the lip of the crater, where they had little shelter. On the left, at Fusilier Bluff, the Mining Company had got out protective galleries in time to baffle the Turco-German miners.

At first our mining policy had been defensive, but on this same day one of our shafts reached the barricade of a favourite Turkish bombing station. A mine was exploded, the barricade levelled, and a crater forty feet in diameter formed. The sky was darkened by the earth thrown up, and men in support and reserve trenches were covered with the falling clods. Brisk rifle fire from the enemy showed that the trenches were thickly occupied at the time, and their losses must have been considerable. A rush was at once made to the crater and a barricade built across it. Captain Cawley, 6th Manchesters, M.P for Prestwich, was shot at night by a Turkish sniper, when shooting over the parapet with his revolver, and the crater became known as “Cawley’s Crater.”

On the 17th of October General Sir Ian Hamilton relinquished the command of the Mediterranean Expeditionary Force amid universal regret, and left for England. He had won the respect, and indeed the affection, of all ranks of his army, by whom he was regarded as a true friend and comrade, prompt in appreciation and unfailing in sympathy. To General Douglas he wrote: “You and your Division have always been consoling thoughts in the anxious moments we have lived through in common, and I want you to have all the luck in the world.” On Sir Ian’s departure, Lieut.-General Sir William Birdwood assumed temporary command in the peninsula until the arrival of General Sir C. Monro.

During October the South-Eastern Mounted Brigade (dismounted) was attached to the 42nd Division. The Brigade consisted of the East Kent, the West Kent and the Sussex Yeomanry, under Brig.-General Clifton-Browne. It remained attached to the Division until the evacuation, and officers and men proved the best of comrades. A system of fortnightly reliefs was now instituted, the 125th and 127th Brigades holding the right sub-sector, with H.Q. at the zigzag in the Gully; the 126th Brigade and the S.E. Mounted Brigade the left, or coastal, sub-sector, with H.Q. at Gurkha Bluff.

On the west of Gully Ravine the line was advanced by an average of forty yards on a front of 300 yards. In no place was the enemy’s line more than 125 yards from the Division’s trenches, and in places it was less than ten. On the 29th and 30th of October the Turks

exploded mines near the Gridiron, blowing in fifteen yards of fire trench, killing two men, and burying six. Three of these were soon extricated, but, in spite of continued efforts, the other three—all miners—were given up for lost. As the Divisional Commander was passing along the trench three days later, he saw to his great delight two of the missing men being brought from the mine-shaft on stretchers. The third, Private Grimes, 5th Manchesters, though obviously on the border of collapse, stoutly refused to be carried. These men had had no food for three days and only one bottle of water between the three. It was largely due to the determination and grit of Private Grimes that they had had the dogged persistence to dig through twelve feet of earth with the aid of one pocket-knife, and so win to safety.

The month of November was not marked by military events of special importance, our constant activity having chastened the enemy’s offensive spirit. Reports from Turkish prisoners indicated that the thorough training that had been given in the bombing school had contributed largely to this result. Mining was very active, and the divisional miners now held the upper hand. On the 25th the enemy injected through a hole in one of the galleries an aromatic gas, which affected the eyes, but not the lungs. Parties of three or four hundred officers and men from each Brigade were sent, in relief, to a newly formed Training School at Mudros for two or three weeks at a time, and derived much benefit therefrom.

Y RAVINE. LOOKING DOWN TO THE SEA.

IN THE FRONT LINE MAN USING A PERISCOPE

IN THE TRENCHES. AN ENTRANCE TO A MINE SHAFT.

SHELTERS TO PROTECT HORSES FROM SHELL FIRE

IN THE FRONT LINE. LOOKING DOWN FUSILIER BLUFF TO THE SEA.

IN THE TRENCHES. MAKING TEA.

GULLY RAVINE STRETCHER BEARERS

During the first half of November there had been occasional heavy showers and some frost. On the 15th-17th a violent storm, accompanied by a deluge of rain, drove the sea higher and higher up the shore, swamping the bivouacs on the beach. In the Gully conditions were even worse. Bales of hay, sacks of bread, drowned mules, were washed down the ravine into the sea. On the night of the 26th a still fiercer storm raged in the peninsula, a storm as disastrous to the combatants as any that ever affected armies in the field. The flood-gates of heaven indeed

Floods and Frost

GULLY RAVINE

opened, and at Anzac and Suvla the trenches were quickly waist deep, and the current swept down like a mill-race—kit, equipment, rations, even men, being washed away. In places the trenches filled, and the troops must drown or stand on the top, a sure target for the Turk had he not been in a like predicament. As in a prairie fire or other of Nature’s more appalling manifestations, the beast of prey and its natural victim flee side by side, or cower together, so Briton and Turk regarded one another as fellow-sufferers rather than as implacable enemies. The gale became a hurricane; the crash of thunder, the blinding flashes of lightning, heightened the sense of catastrophe, and the bitter cold made it the more unbearable. Piers and landing-stages were destroyed and the beaches strewn with wreckage. During the 27th the rain came down steadily; then the wind veered to the north and brought snow and cruel blizzards. A hard frost followed, and at Anzac and Suvla men were frozen to death; others lost their limbs—some their reason—and cases of frost-bite were very numerous. In the south the conditions were less disastrous than further north, but the suffering of the troops was intense. Altogether about 10,000 sick had to be removed from the peninsula as an outcome of the four days’ tragedy. When the floods subsided Gully Ravine was a bed of deep mud, and its passage—a vital matter to the Division—could only be accomplished with infinite labour.

The activity of the hostile artillery increased as superior guns and munitions of war arrived from Germany, and the bombardments became more accurate and deadly On December 14 Lieutenant W R. Hartley, 7th Lancashire Fusiliers, led a patrol with great boldness and judgment close up to the Turkish trenches and located the entrance of a mine-shaft in the Gridiron, only six yards from a crater occupied by our men. Captain A. W. Boyd, of the same battalion, accompanied by Corporal W. Downton and Privates F. Mottershead and C. Bent, volunteered to carry out the destruction of this minehead on the night of the 15th. Unobserved by the enemy they succeeded in placing a charge of forty pounds of gelignite in position in the Turkish trench, the charge being laid by Mottershead, who had originally discovered the mine-shaft. In addition to the electric wire a thin rope was attached so that a slight jerk would cause the charge

to fall into the shaft; and as it was essential that the rope should be laid in a straight line Mottershead had to return to his trench over the Turkish barbed wire and in full view of the enemy. This was successfully accomplished; the rope was jerked, and the charge fired. On the following night Lieutenant Hartley (killed three days later) ascertained that the entrance to the shaft had been completely filled. Mottershead was awarded the D.C.M., and the gallant act was specially mentioned in 8th Corps Orders, the last paragraph of which stated that: “This enterprise is only part of the good work that has been done recently by this battalion under the command of Major W.J. Law, and the keenness and energy displayed are deserving of all praise.”

Lord Kitchener had visited the peninsula in the middle of November, and on his return to England had reported in favour of evacuation. On December 8 General Monro issued orders to evacuate Suvla and Anzac, and on the 16th the withdrawal of 80,000 men, nearly 5000 animals, 2000 vehicles and 200 guns began. The highest estimate of probable loss that might be incurred in this most difficult and critical of operations was fifty per cent.; the lowest, fifteen per cent. Preparation was made at Mudros to accommodate from 5000 to 10,000 wounded, yet the evacuation was carried out without loss. It was one of the finest and most wonderful achievements of this or any other war, and all ranks shared the credit —though in very different degrees—from General Birdwood down to the humblest Indian mule driver.

Two minor operations were arranged for December 19 to take place simultaneously with an advance of the 52nd Division by the Krithia Nullah and the evacuation of Suvla and Anzac. Mines were laid at the Gridiron and at the east end of Fusilier Bluff. The intention was to take advantage of the explosions to establish bombing stations in the craters formed. The “jam-tin” bombs were now obsolete, and those used were the Mills and “cricket-ball” types. The task at the Gridiron was assigned to the 125th Brigade, the troops attacking being drawn from the 7th Lancashire Fusiliers, with some of the 1/2nd (West Lancashire) Field Company, R.E. The 6th Battalion held the original line and supplied catapult parties to fire

from behind. Major Law was to have directed operations, but this able and gallant officer was killed two hours before the time fixed for the attack, and Captain Gledhill assumed temporary command of the 7th Battalion, Captain Boyd being in charge of the attacking party. The artillery gave strong support. The mine was exploded on the far side of a great crater which had a Turkish and English trench on either side. The explosion blew in the enemy trench and extended the crater, which the attacking party crossed, and then pressed down the horns of the Turkish trench and constructed barricades. By 6 p.m. the new line was well established in spite of rifle fire and enfilade fire from machine-guns. A Turkish attack at 9.40 p.m. succeeded in driving our men out, but Captain Boyd with great resource and promptness organized a counter-attack, and within fifteen minutes the lost ground had been retaken and a further gain made. In fact, the bombing parties had to be restrained from going too far down the enemy trenches in pursuit. A lot of work had to be done to make the crater tenable, and assistance was sent. A bomb team of the Sussex Yeomanry did remarkably good work in consolidating the left trench under heavy machine-gun fire, which continued all night. By daylight they had succeeded in deepening and sandbagging the trenches and in digging through from Cawley’s Crater into the new one. Of two mines laid only one had exploded at first, but after the counter-attack our men were withdrawn into safety and the second mine was fired. It caught a number of Turks who were seen pressing up a sap, probably with the intention of counterattacking again. Lieut.-General Sir Francis Davies, the Corps Commander, telegraphed his congratulations and gave permission for the new crater to be called officially “Boyd’s Crater.”

GULLY RAVINE THROUGH THE MUD

Similar operations at Fusilier Bluff were not, however, successful. Parties of the 9th and 10th Manchesters, supported by bombers of the 5th East Lancashires and the W. Lancs. Field Company, R.E., went forward pluckily, and several got within a yard or two of the

LIEUT. SMITH, V.C., 1/5 BN. EAST LANCASHIRE REGT.

The second V.C. enemy trench, but had to be withdrawn. The retirement was effected with coolness and judgment by Lieutenant Simpson, R.E., who, though wounded, checked a bayonet rush of the enemy. The casualties in both places amounted to one officer and twelve men killed and four officers and eighty-seven men wounded. The artillery and trench mortars gave valuable assistance throughout. The following message from General Birdwood, Commanding the Dardanelles Army, was received on the morning of the 20th December: “Well done, 42nd Division!”

On the 22nd December Lieutenant Alfred Victor Smith, 5th Battalion East Lancashire Regiment, dropped a bomb when in the act of throwing it. It fell to the bottom of the trench in which were a number of men. He shouted a warning, and he himself got into safety, but, seeing that the others could not, he returned and threw himself on the bomb just as it exploded. He was killed instantly, but his comrades were saved. It is not too much to say that the account of this act of heroic devotion sent a thrill through the Empire, and there was general satisfaction with the decision to confer the V.C. after death. The 126th Brigade was justly proud of the fact that both V.C.’s so far gained by the division had been won by officers of its battalions.

Christmas festivities were held on different dates by the various units according to their positions in the line or in reserve. Taking into consideration the adverse conditions that prevailed, an excellent bill of fare was provided—roast beef, plum-pudding with rum sauce, a pint of beer for each man, and various delicacies from canteen stores. Christmas day was bright and frosty, and the Divisional Band turned Gully Ravine into a pleasure resort by playing Christmas carols at appointed spots in the ravine. One battalion thought that greater delicacy might have been shown in the choice of carols. They had been relieved from the front line on Christmas Eve, and had just settled down in “rest” bivouacs near Gully Beach to a muchneeded sleep, when, in the early hours of Christmas morning, they were ordered to turn out and move to a distant bivouac far up the ravine. As they put on their equipment in a most unchristian frame of mind, the band started to serenade Divisional Headquarters with

Hostile aircraft, both bombing and observation planes, had greatly increased in number since the evacuation of Suvla and Anzac, the Turks being naturally anxious to learn what was happening at Helles. A note attached to an old bomb was thrown from the enemy trenches into the trenches occupied by the Sussex Yeomanry. It contained this message: “Good-bye, Sussex Yeomanry. Sorry you can’t stay, but we’ll meet again on the Canal.”

The Turk was not looked upon with the blend of amusement (at his egregiousness) and detestation (of his manners and brutality) with which the Boche was regarded by all who came in contact with him. Rather was he respected as a brave foeman and esteemed as a sportsman. Among other things to his credit, he had treated wounded prisoners well and had respected the Red Cross flag. The flag of the Advanced Dressing Station at “Y” Beach was in full view of the Turks for three months, but there was no shelling and no casualty from shells. When the Field Ambulance of the South Eastern Mounted Brigade took over in December, the Union Jack was hoisted in addition to the Red Cross flag. The change was made at midnight, and promptly at dawn the Turks opened fire. The first two shells were short; then came three “overs,” and the sixth—and last—brought down the flag-pole. The Medical Officer who records the above also testifies that during a long and heavy bombardment of “Y” Ravine hostile shells were dropping all along the tracks in the vicinity of the Advanced Dressing Station, the shooting being “dead accurate,” but not one shell came within sixty yards of the Red Cross flag that flew over the Dressing Station.

The Evacuation “Christians Awake!” and as the men prepared to move off the tune changed to a less familiar air. “What are they playing now?” asked an officer. “‘God rest you, merry gentlemen,’” came the reply in a voice choked with emotion. With twilight a silence fell. No gun fired, no rifle cracked, until the moon showed over the shoulder of Achi Baba, when missiles of destruction of every kind, from the cricketball bomb to the giant shells from monitors out at sea, pitched into the enemy lines.

Rumour had had little rest since August, 1914, yet she remained very vigorous and active. She

had been particularly busy in Helles since the evacuation of the northern landings. To obtain ready credence, the rumour-monger must support his theory with convincing circumstantial evidence, as, for example, that he had been told by a friend, whose platoonsergeant’s brother was a batman at Divisional Headquarters, that there had been a terrible increase in the slaughter of the staff chickens. The 8th Army Corps Special Order of the Day, issued on December 20, reassured those who regarded evacuation as an admission of defeat, and, it must be confessed, disappointed those who felt that the object of the landings on Gallipoli had already been defeated and that they could therefore serve a more useful purpose elsewhere. The Order indicated that there was no intention to abandon Helles. Confirmation of a resolve to retain a hold on the peninsula appeared in the shape of the arrival off Helles of transports carrying fresh troops, the 13th and the veteran 29th Divisions; and now Rumour whispered of still another attempt to march across Achi Baba. But on December 27 and 28 innumerable fatigue parties were detailed to collect all stores and baggage at dumps for transport to the beaches, as the 42nd Division was to be relieved at once by the 13th Division under Major-General Stanley Maude. With much labour the baggage was taken to “V” Beach, only to be ordered to “W” Beach.

At 5 p.m. on the 29th the remnants that were left of the once proud battalions of East Lancashire Territorials moved off on their last march in Gallipoli—a sorry procession. The distance to “V” Beach from which most of the men embarked was about five miles, much of it through deep mud, and it was sheer grit that pulled them through, for their frames were wasted and enfeebled through sickness, exposure and unceasing strain; their feet, sodden through weeks of standing in muddy and water-logged trenches, were tender and painful; they were, it is true, quitting the scene of much misery and suffering, but they were not leaving as victors. Though they had done and endured all that was possible their object remained unachieved, and they were depressed by the sense of failure. Not unreasonably they felt that the Territorials had been neglected by the authorities at home—that had drafts been supplied in full measure from their second line they might have won through. At the date of

Turn static files into dynamic content formats.

Create a flipbook
Issuu converts static files into: digital portfolios, online yearbooks, online catalogs, digital photo albums and more. Sign up and create your flipbook.